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Age impairs sit-to-walk motor performance.
Journal of Biomechanics 2009 October 17
Sit-to-walk (STW) is a common functional and transitional task which challenges an individual's postural control systems. As aging is associated with an increased risk of falls during transitional movements, we biomechanically investigated the STW movement task in 12 healthy young and 12 healthy elderly individuals. Performance was evaluated utilizing motion analysis and two force plates. The principal finding of this study was the impaired performance of the healthy older adults. The older adults generated significantly less momentum prior to rising (p=0.011) and further delayed (p<0.001) the initiation of gait until standing more upright (p=0.036). The young adults successfully merged the component tasks shortly after seat-off and displayed significantly greater step length (p<0.001), step velocity (p<0.001), and tolerated greater separation of the center of pressure and center of mass at the end single support phase of the initial step (p=0.001). While the young adults fluidly merged the standing and walking task components, the older adults displayed a conservative movement performance during the STW task thereby limiting threats to their postural stability.
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